import CALENDAR from "./calendar.js";

class Calendar {
    constructor({ date, selected, startDate, endDate, range } = {}) {
        // 当前日期
        this.date = this.getDate(new Date()); // 当前初入日期
        // 打点信息
        this.selected = selected || [];
        // 范围开始
        this.startDate = startDate;
        // 范围结束
        this.endDate = endDate;
        this.range = range;
        // 多选状态
        this.cleanMultipleStatus();
        // 每周日期
        this.weeks = {};
        // this._getWeek(this.date.fullDate)
    }
    /**
     * 设置日期
     * @param {Object} date
     */
    setDate(date) {
        this.selectDate = this.getDate(date);
        this._getWeek(this.selectDate.fullDate);
    }

    /**
     * 清理多选状态
     */
    cleanMultipleStatus() {
        this.multipleStatus = {
            before: "",
            after: "",
            data: []
        };
    }

    /**
     * 重置开始日期
     */
    resetSatrtDate(startDate) {
        // 范围开始
        this.startDate = startDate;
    }

    /**
     * 重置结束日期
     */
    resetEndDate(endDate) {
        // 范围结束
        this.endDate = endDate;
    }

    /**
     * 获取任意时间
     */
    getDate(date, AddDayCount = 0, str = "day") {
        if (!date) {
            date = new Date();
        }
        if (typeof date !== "object") {
            date = date.replace(/-/g, "/");
        }
        const dd = new Date(date);
        switch (str) {
            case "day":
                dd.setDate(dd.getDate() + AddDayCount); // 获取AddDayCount天后的日期
                break;
            case "month":
                if (dd.getDate() === 31 && AddDayCount > 0) {
                    dd.setDate(dd.getDate() + AddDayCount);
                } else {
                    const preMonth = dd.getMonth();
                    dd.setMonth(preMonth + AddDayCount); // 获取AddDayCount天后的日期
                    const nextMonth = dd.getMonth();
                    // 处理 pre 切换月份目标月份为2月没有当前日(30 31) 切换错误问题
                    if (AddDayCount < 0 && preMonth !== 0 && nextMonth - preMonth > AddDayCount) {
                        dd.setMonth(nextMonth + (nextMonth - preMonth + AddDayCount));
                    }
                    // 处理 next 切换月份目标月份为2月没有当前日(30 31) 切换错误问题
                    if (AddDayCount > 0 && nextMonth - preMonth > AddDayCount) {
                        dd.setMonth(nextMonth - (nextMonth - preMonth - AddDayCount));
                    }
                }
                break;
            case "year":
                dd.setFullYear(dd.getFullYear() + AddDayCount); // 获取AddDayCount天后的日期
                break;
        }
        const y = dd.getFullYear();
        const m = dd.getMonth() + 1 < 10 ? "0" + (dd.getMonth() + 1) : dd.getMonth() + 1; // 获取当前月份的日期，不足10补0
        const d = dd.getDate() < 10 ? "0" + dd.getDate() : dd.getDate(); // 获取当前几号，不足10补0
        return {
            fullDate: y + "-" + m + "-" + d,
            year: y,
            month: m,
            date: d,
            day: dd.getDay()
        };
    }

    /**
     * 获取上月剩余天数
     */
    _getLastMonthDays(firstDay, full) {
        let dateArr = [];
        for (let i = firstDay; i > 0; i--) {
            const beforeDate = new Date(full.year, full.month - 1, -i + 1).getDate();
            dateArr.push({
                date: beforeDate,
                month: full.month - 1,
                lunar: this.getlunar(full.year, full.month - 1, beforeDate),
                disable: true
            });
        }
        return dateArr;
    }
    /**
     * 获取本月天数
     */
    _currentMonthDys(dateData, full) {
        let dateArr = [];
        let fullDate = this.date.fullDate;
        for (let i = 1; i <= dateData; i++) {
            let nowDate = full.year + "-" + (full.month < 10 ? full.month : full.month) + "-" + (i < 10 ? "0" + i : i);
            // 是否今天
            let isDay = fullDate === nowDate;
            // 获取打点信息
            let info =
                this.selected &&
                this.selected.find((item) => {
                    if (this.dateEqual(nowDate, item.date)) {
                        return item;
                    }
                });

            // 日期禁用
            let disableBefore = true;
            let disableAfter = true;
            if (this.startDate) {
                // let dateCompBefore = this.dateCompare(this.startDate, fullDate)
                // disableBefore = this.dateCompare(dateCompBefore ? this.startDate : fullDate, nowDate)
                disableBefore = this.dateCompare(this.startDate, nowDate);
            }

            if (this.endDate) {
                // let dateCompAfter = this.dateCompare(fullDate, this.endDate)
                // disableAfter = this.dateCompare(nowDate, dateCompAfter ? this.endDate : fullDate)
                disableAfter = this.dateCompare(nowDate, this.endDate);
            }
            let multiples = this.multipleStatus.data;
            let checked = false;
            let multiplesStatus = -1;
            if (this.range) {
                if (multiples) {
                    multiplesStatus = multiples.findIndex((item) => {
                        return this.dateEqual(item, nowDate);
                    });
                }
                if (multiplesStatus !== -1) {
                    checked = true;
                }
            }
            let data = {
                fullDate: nowDate,
                year: full.year,
                date: i,
                multiple: this.range ? checked : false,
                beforeMultiple: this.dateEqual(this.multipleStatus.before, nowDate),
                afterMultiple: this.dateEqual(this.multipleStatus.after, nowDate),
                month: full.month,
                lunar: this.getlunar(full.year, full.month, i),
                disable: !(disableBefore && disableAfter),
                isDay
            };
            if (info) {
                data.extraInfo = info;
            }

            dateArr.push(data);
        }
        return dateArr;
    }
    /**
     * 获取下月天数
     */
    _getNextMonthDays(surplus, full) {
        let dateArr = [];
        for (let i = 1; i < surplus + 1; i++) {
            dateArr.push({
                date: i,
                month: Number(full.month) + 1,
                lunar: this.getlunar(full.year, Number(full.month) + 1, i),
                disable: true
            });
        }
        return dateArr;
    }

    /**
     * 获取当前日期详情
     * @param {Object} date
     */
    getInfo(date) {
        if (!date) {
            date = new Date();
        }
        const dateInfo = this.canlender.find((item) => item.fullDate === this.getDate(date).fullDate);
        return dateInfo;
    }

    /**
     * 比较时间大小
     */
    dateCompare(startDate, endDate) {
        // 计算截止时间
        startDate = new Date(startDate.replace("-", "/").replace("-", "/"));
        // 计算详细项的截止时间
        endDate = new Date(endDate.replace("-", "/").replace("-", "/"));
        if (startDate <= endDate) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * 比较时间是否相等
     */
    dateEqual(before, after) {
        // 计算截止时间
        before = new Date(before.replace("-", "/").replace("-", "/"));
        // 计算详细项的截止时间
        after = new Date(after.replace("-", "/").replace("-", "/"));
        if (before.getTime() - after.getTime() === 0) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * 获取日期范围内所有日期
     * @param {Object} begin
     * @param {Object} end
     */
    geDateAll(begin, end) {
        var arr = [];
        var ab = begin.split("-");
        var ae = end.split("-");
        var db = new Date();
        db.setFullYear(ab[0], ab[1] - 1, ab[2]);
        var de = new Date();
        de.setFullYear(ae[0], ae[1] - 1, ae[2]);
        var unixDb = db.getTime() - 24 * 60 * 60 * 1000;
        var unixDe = de.getTime() - 24 * 60 * 60 * 1000;
        for (var k = unixDb; k <= unixDe; ) {
            k = k + 24 * 60 * 60 * 1000;
            arr.push(this.getDate(new Date(parseInt(k))).fullDate);
        }
        return arr;
    }
    /**
     * 计算阴历日期显示
     */
    getlunar(year, month, date) {
        return CALENDAR.solar2lunar(year, month, date);
    }
    /**
     * 设置打点
     */
    setSelectInfo(data, value) {
        this.selected = value;
        this._getWeek(data);
    }

    /**
     *  获取多选状态
     */
    setMultiple(fullDate) {
        let { before, after } = this.multipleStatus;

        if (!this.range) return;
        if (before && after) {
            this.multipleStatus.before = fullDate;
            this.multipleStatus.after = "";
            this.multipleStatus.data = [];
        } else {
            if (!before) {
                this.multipleStatus.before = fullDate;
            } else {
                this.multipleStatus.after = fullDate;
                if (this.dateCompare(this.multipleStatus.before, this.multipleStatus.after)) {
                    this.multipleStatus.data = this.geDateAll(this.multipleStatus.before, this.multipleStatus.after);
                } else {
                    this.multipleStatus.data = this.geDateAll(this.multipleStatus.after, this.multipleStatus.before);
                }
            }
        }
        this._getWeek(fullDate);
    }

    /**
     * 获取每周数据
     * @param {Object} dateData
     */
    _getWeek(dateData) {
        const { year, month } = this.getDate(dateData);
        let firstDay = new Date(year, month - 1, 1).getDay();
        let currentDay = new Date(year, month, 0).getDate();
        let dates = {
            lastMonthDays: this._getLastMonthDays(firstDay, this.getDate(dateData)), // 上个月末尾几天
            currentMonthDys: this._currentMonthDys(currentDay, this.getDate(dateData)), // 本月天数
            nextMonthDays: [], // 下个月开始几天
            weeks: []
        };
        let canlender = [];
        const surplus = 42 - (dates.lastMonthDays.length + dates.currentMonthDys.length);
        dates.nextMonthDays = this._getNextMonthDays(surplus, this.getDate(dateData));
        canlender = canlender.concat(dates.lastMonthDays, dates.currentMonthDys, dates.nextMonthDays);
        let weeks = {};
        // 拼接数组  上个月开始几天 + 本月天数+ 下个月开始几天
        for (let i = 0; i < canlender.length; i++) {
            if (i % 7 === 0) {
                weeks[parseInt(i / 7)] = new Array(7);
            }
            weeks[parseInt(i / 7)][i % 7] = canlender[i];
        }
        this.canlender = canlender;
        this.weeks = weeks;
    }

    //静态方法
    // static init(date) {
    // 	if (!this.instance) {
    // 		this.instance = new Calendar(date);
    // 	}
    // 	return this.instance;
    // }
}

export default Calendar;
